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Javdani H, Etemad L, Moshiri M, Zarban A, Hanafi-Bojd MY. Effect of tannic acid-templated mesoporous silica nanoparticles on iron-induced oxidative stress and liver toxicity in rats. Toxicol Rep 2021; 8:1721-1728. [PMID: 34692422 PMCID: PMC8512627 DOI: 10.1016/j.toxrep.2021.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 09/11/2021] [Accepted: 09/30/2021] [Indexed: 11/28/2022] Open
Abstract
The present study sought to investigate the effects of amino-functionalized tannic acid-templated mesoporous silica nanoparticles (TA-MS-NH2 NPs) on giving rats protection against iron-induced liver toxicity. To this end, the TA-MS-NH2 NPs were characterized using field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), and Fourier-transform infrared spectroscopy (FTIR). Moreover, 50 Wistar rats were randomly divided into one control group (group 1) and four experimental groups (groups 2- 5) (n = 10), each of which received 100 mg/kg oral normal saline and FeSO4, respectively. Then, post-exposure hepatotoxicity and oxidative stress markers were measured in two intervals, i.e., after 4 and 24 h, followed by the measurement of the acute iron toxicity. Furthermore, hepatotoxicity markers, including the alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), and total antioxidant capacity (TAC), were measured via Ferric Reducing Antioxidant Power (FRAP) and 2,2,1-diphenyl-1-picrylhydrazyl (DPPH) assays. Also, malondialdehyde (MDA), total thiol groups, advanced oxidation protein products (AOPP), and nitrite/nitrate (NOx) levels were measured as oxidative stress markers in the serum samples. The results indicated that oral administration of iron significantly elevated the liver enzymes and altered the level of oxidative stress markers. It was also found that treatment with TA-MS-NH2 NPs meaningfully protected against hepatotoxicity, decreased ALT, AST, ALP, and significantly improved oxidative stress markers by decreasing MDA, AOPP, and NOx levels and increasing TAC and thiol group contents, proving that TA-MS-NH2 NPs could protect rats against iron-induced acute liver toxicity through their antioxidant features.
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Key Words
- ALP, alkaline phosphatase
- ALT, alanine aminotransferase
- AOPP, advanced oxidation protein products
- AST, aspartate aminotransferase
- Acute iron toxicity
- Antioxidant activity
- DLS, dynamic light scattering
- DPPH, 2,2,1-diphenyl-1-picrylhydrazyl
- FE-SEM, field-emission scanning electron microscope
- FRAP, Ferric Reducing Antioxidant Power
- FT-IR, Fourier-transform infrared spectroscopy
- Liver damage
- MDA, malondialdeide
- Mesoporous silica nanoparticles
- Oxidative stress
- TA-MS-NH2 NPs, amino-functionalized tannic acid-templated mesoporous silica nanoparticles
- TAC, total antioxidant capacity
- TEM, transmission electron microscopy
- Tannic acid
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Affiliation(s)
- Hossein Javdani
- Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran.,Molecular Medicine Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Leila Etemad
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Moshiri
- Medical Toxicology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Asghar Zarban
- Cardiovascular Diseases Research Center, Birjand University of Medical Sciences, Birjand, Iran.,Clinical Biochemistry Department, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran
| | - Mohammad Yahya Hanafi-Bojd
- Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran.,Nanomedicine Department, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran
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The association between the metabolic syndrome and iron status in pre- and postmenopausal women: Korean National Health and Nutrition Examination Survey (KNHANES) in 2012. Br J Nutr 2021; 127:630-640. [PMID: 33899716 DOI: 10.1017/s0007114521001331] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We aim to determine the association between Fe status and the metabolic syndrome (MetS) during menopause. Records of 1069 premenopausal and 703 postmenopausal Korean women were retrieved from the database of the fifth Korean National Health and Nutrition Examination Survey (KNHANES V 2012) and analysed. The association between the MetS and Fe status was performed using multivariable-adjusted analyses, subsequently develop a prediction model for the MetS by margin effects. We found that the risk of Fe depletion among postmenopausal women was lower than premenopausal women (PR = 0·813, 95 % CI 0·668, 0·998, P = 0·038). The risk of the MetS was 2·562-fold lower among premenopausal women with than without Fe depletion (PR = 0·390, 95 % CI 0·266, 0·571, P < 0·001). In contrast, the risk of the MetS tended to be higher among postmenopausal women with than without Fe depletion (PR = 1·849, 95 % CI 1·406, 2·432, P < 0·001). When the serum ferritin levels increased, the risk of the MetS increased in both premenopausal women and postmenopausal women. The margin effects showed that an increase in serum Hb and ferritin was associated with an increase in the risk of the MetS according to menopausal status and age group. Therefore, ferritin is the most validated and widely used Fe marker, could be a potential clinical value in predicting and monitoring the MetS during menopause. Further prospective or longitudinal studies, especially, clinically related studies on menopause and Fe status, are needed to clarify the causality between serum ferritin levels and the MetS that could offer novel treatments for the MetS.
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McMullen PD, Bhattacharya S, Woods CG, Pendse SN, McBride MT, Soldatow VY, Deisenroth C, LeCluyse EL, Clewell RA, Andersen ME. Identifying qualitative differences in PPARα signaling networks in human and rat hepatocytes and their significance for next generation chemical risk assessment methods. Toxicol In Vitro 2020; 64:104463. [DOI: 10.1016/j.tiv.2019.02.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 02/14/2019] [Accepted: 02/19/2019] [Indexed: 12/14/2022]
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Lin Y, Shu X, Fu Z, Hu H, Wang WX, Gong S. Influences of different Fe sources on Fe bioavailability and homeostasis in SD rats. Anim Sci J 2019; 90:1377-1387. [PMID: 31436009 DOI: 10.1111/asj.13254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/05/2019] [Accepted: 05/27/2019] [Indexed: 11/28/2022]
Abstract
The purpose of this study was to determine whether the enteric coating process affects growth performance, Fe bioavailability, and gene expression levels that maintain iron balance in the body. The test was divided into the control group, ferrous sulfate group, ferrous fumarate group, ferrous glycine chelate(1:1) (Fe-Gly(1:1)) group, ferrous glycine chelate(2:1) (Fe-Gly(2:1)) group, enteric-coated Fe-Gly(1:1) group, and enteric-coated Fe-Gly(2:1) group. The results showed that the growth performance of the rats in each iron supplement group was no significant difference among them. The results of serum biochemical indicators showed that the antioxidant capacity of the rats in the iron supplement group after enteric coating increased. The iron supplementation effect of Fe-Gly(1:1) and Fe-Gly(2:1) was better than that of ferrous sulfate, and the effect of Fe-Gly(1:1) after enteric coating was enhanced. The expression levels of IRP1 and IRP2 in the genes of enteric-coated Fe-Gly(1:1) and enteric-coated Fe-Gly(2:1) were significantly higher than those of ferrous sulfate. The expression levels of IRP1 and IRP2 in the protein of enteric-coated Fe-Gly(1:1) group were significantly higher than those in the Fe-Gly(1:1) group. The above results show that Fe-Gly can improve the bioavailability and antioxidant capacity of iron and reduce the iron output of feces after enteric coating.
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Affiliation(s)
- Yu Lin
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Xugang Shu
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Zhihuan Fu
- College of Animal Science and Technology, Zhongkai Agricultural Engineering College, Guangzhou, China
| | - Hongchao Hu
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Wen-Xiong Wang
- Hong Kong University of Science and Technology, HongKong, China
| | - Sheng Gong
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
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Cocato ML, Lobo AR, Azevedo-Martins AK, Filho JM, de Sá LRM, Colli C. Effects of a moderate iron overload and its interaction with yacon flour, and/or phytate, in the diet on liver antioxidant enzymes and hepatocyte apoptosis in rats. Food Chem 2019; 285:171-179. [PMID: 30797332 DOI: 10.1016/j.foodchem.2019.01.142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 12/26/2018] [Accepted: 01/21/2019] [Indexed: 12/31/2022]
Abstract
The effect of moderate Fe overload in the diet and its interaction with phytate, and/or yacon flour (YF), recognized as an inhibitor, and facilitator, of Fe absorption, respectively, was evaluated in healthy rats. For this purpose the following parameters were analyzed: (1) apparent iron (Fe), copper (Cu) and zinc (Zn) absorption; (2) blood Fe; (3) blood lipids (cholesterol, tryacylglicerol); (4) blood AST and ALT; (5) liver histology (histopathology, hemosiderin depots, apoptosis index; (6) liver fatty acid incorporation; (7) liver antioxidant enzyme activity. Moderate Fe overload may cause change in some liver markers (hemosiderin depots, apoptosis index and GPx) and blood lipids (total cholesterol and VLDL) and the interaction with yacon flour, and phytate, in the Fe overloaded diets may exert a protective effect on these alterations.
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Affiliation(s)
- Maria Lucia Cocato
- Department of Food Experimental and Experimental Nutrition, Pharmaceutical Sciences Faculty of São Paulo University, 05508 900 São Paulo, SP, Brazil.
| | - Alexandre Rodrigues Lobo
- Department of Food Experimental and Experimental Nutrition, Pharmaceutical Sciences Faculty of São Paulo University, 05508 900 São Paulo, SP, Brazil
| | | | - Jorge Mancini Filho
- Department of Food Experimental and Experimental Nutrition, Pharmaceutical Sciences Faculty of São Paulo University, 05508 900 São Paulo, SP, Brazil.
| | - Lilian Rose Marques de Sá
- Department of Pathology, School of Veterinary Medicine and Animal Health of São Paulo University, 05508 900 São Paulo, SP, Brazil.
| | - Célia Colli
- Department of Food Experimental and Experimental Nutrition, Pharmaceutical Sciences Faculty of São Paulo University, 05508 900 São Paulo, SP, Brazil.
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Erukainure OL, Onifade OF, Odjobo BO, Olasehinde TA, Adesioye TA, Tugbobo-Amisu AO, Adenekan SO, Okonrokwo GI. Ethanol extract of Tetrapleura tetraptera fruit peels: Chemical characterization, and antioxidant potentials against free radicals and lipid peroxidation in hepatic tissues. JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE 2018. [DOI: 10.1016/j.jtusci.2017.03.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ochuko L. Erukainure
- Department of Food Technology, Federal Institute of Industrial Research, Oshodi, Nigeria
| | | | - Benedict O. Odjobo
- Bio – Resources Development Centre, National Biotechnology Development Agency, Abuja, Nigeria
| | - Tosin A. Olasehinde
- Department of Food Technology, Federal Institute of Industrial Research, Oshodi, Nigeria
| | - Temiloluwa A. Adesioye
- Department of Food Technology, Federal Institute of Industrial Research, Oshodi, Nigeria
| | | | | | - Grace I. Okonrokwo
- Technology Transfer Division, Federal Institute of Industrial Research, Oshodi, Nigeria
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7
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Corton JC, Peters JM, Klaunig JE. The PPARα-dependent rodent liver tumor response is not relevant to humans: addressing misconceptions. Arch Toxicol 2017; 92:83-119. [PMID: 29197930 DOI: 10.1007/s00204-017-2094-7] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 10/12/2017] [Indexed: 12/17/2022]
Abstract
A number of industrial chemicals and therapeutic agents cause liver tumors in rats and mice by activating the nuclear receptor peroxisome proliferator-activated receptor α (PPARα). The molecular and cellular events by which PPARα activators induce rodent hepatocarcinogenesis have been extensively studied elucidating a number of consistent mechanistic changes linked to the increased incidence of liver neoplasms. The weight of evidence relevant to the hypothesized mode of action (MOA) for PPARα activator-induced rodent hepatocarcinogenesis is summarized here. Chemical-specific and mechanistic data support concordance of temporal and dose-response relationships for the key events associated with many PPARα activators. The key events (KE) identified in the MOA are PPARα activation (KE1), alteration in cell growth pathways (KE2), perturbation of hepatocyte growth and survival (KE3), and selective clonal expansion of preneoplastic foci cells (KE4), which leads to the apical event-increases in hepatocellular adenomas and carcinomas (KE5). In addition, a number of concurrent molecular and cellular events have been classified as modulating factors, because they potentially alter the ability of PPARα activators to increase rodent liver cancer while not being key events themselves. These modulating factors include increases in oxidative stress and activation of NF-kB. PPARα activators are unlikely to induce liver tumors in humans due to biological differences in the response of KEs downstream of PPARα activation. This conclusion is based on minimal or no effects observed on cell growth pathways and hepatocellular proliferation in human primary hepatocytes and absence of alteration in growth pathways, hepatocyte proliferation, and tumors in the livers of species (hamsters, guinea pigs and cynomolgus monkeys) that are more appropriate human surrogates than mice and rats at overlapping dose levels. Despite this overwhelming body of evidence and almost universal acceptance of the PPARα MOA and lack of human relevance, several reviews have selectively focused on specific studies that, as discussed, contradict the consensus opinion and suggest uncertainty. In the present review, we systematically address these most germane suggested weaknesses of the PPARα MOA.
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Affiliation(s)
- J Christopher Corton
- Integrated Systems Toxicology Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, 109 T.W. Alexander Dr, MD-B105-03, Research Triangle Park, NC, 27711, USA.
| | - Jeffrey M Peters
- The Department of Veterinary and Biomedical Sciences and Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA, 16803, USA
| | - James E Klaunig
- Department of Environmental Health, Indiana University, Bloomington, IN, 47402, USA
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8
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Theriot CA, Westby CM, Morgan JLL, Zwart SR, Zanello SB. High dietary iron increases oxidative stress and radiosensitivity in the rat retina and vasculature after exposure to fractionated gamma radiation. NPJ Microgravity 2016; 2:16014. [PMID: 28725729 PMCID: PMC5515516 DOI: 10.1038/npjmgrav.2016.14] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 12/17/2015] [Accepted: 12/29/2015] [Indexed: 11/10/2022] Open
Abstract
Radiation exposure in combination with other space environmental factors including microgravity, nutritional status, and deconditioning is a concern for long-duration space exploration missions. Astronauts experience altered iron homeostasis due to adaptations to microgravity and an iron-rich food system. Iron intake reaches three to six times the recommended daily allowance due to the use of fortified foods on the International Space Station. Iron is associated with certain optic neuropathies and can potentiate oxidative stress. This study examined the response of eye and vascular tissue to gamma radiation exposure (3 Gy fractionated at 37.5 cGy per day every other day for 8 fractions) in rats fed an adequate-iron diet or a high-iron diet. Twelve-week-old Sprague-Dawley rats were assigned to one of four experimental groups: adequate-iron diet/no radiation (CON), high-iron diet/no radiation (IRON), adequate-iron diet/radiation (RAD), and high-iron diet/radiation (IRON+RAD). Animals were maintained on the corresponding iron diet for 2 weeks before radiation exposure. As previously published, the high-iron diet resulted in elevated blood and liver iron levels. Dietary iron overload altered the radiation response observed in serum analytes, as evidenced by a significant increase in catalase levels and smaller decrease in glutathione peroxidase and total antioxidant capacity levels. 8-OHdG immunostaining, showed increased intensity in the retina after radiation exposure. Gene expression profiles of retinal and aortic vascular samples suggested an interaction between the response to radiation and high dietary iron. This study suggests that the combination of gamma radiation and high dietary iron has deleterious effects on retinal and vascular health and physiology.
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Affiliation(s)
- Corey A Theriot
- Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX, USA
| | - Christian M Westby
- Universities Space Research Association, Division of Space Life Sciences, Houston, TX, USA
| | - Jennifer L L Morgan
- Oak Ridge Associated Universities, NASA Johnson Space Center, Houston, TX, USA
| | - Sara R Zwart
- Universities Space Research Association, Division of Space Life Sciences, Houston, TX, USA
| | - Susana B Zanello
- Universities Space Research Association, Division of Space Life Sciences, Houston, TX, USA
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9
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Gao W, Li X, Gao Z, Li H. Iron increases diabetes-induced kidney injury and oxidative stress in rats. Biol Trace Elem Res 2014; 160:368-75. [PMID: 24996958 DOI: 10.1007/s12011-014-0021-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Accepted: 05/19/2014] [Indexed: 01/02/2023]
Abstract
Diabetic nephropathy is both a common and a severe complication of diabetes mellitus. Iron is an essential trace element. However, excess iron is toxic, playing a role in the pathogenesis of diabetic nephropathy. The present study aimed to determine the extent of the interaction between iron and type 2 diabetes in the kidney. Male rats were randomly assigned into four groups: control, iron (300-mg/kg iron dextran), diabetes (a single dose of intraperitoneal streptozotocin), and iron + diabetes group. Iron supplementation resulted in a higher liver iron content, and diabetic rats showed higher serum glucose compared with control rats, which confirmed the model as iron overload and diabetic. It was found that iron + diabetes group showed a greater degree of kidney pathological changes, a remarkable reduction in body weight, and a significant increase in relative kidney weight and iron accumulation in rat kidneys compared with iron or diabetes group. Moreover, malondialdehyde values in the kidney were higher in iron + diabetes group than in iron or diabetes group, sulfhydryl concentration and glutathione peroxidase activity were decreased by the diabetes and iron + diabetes groups, and protein oxidation and nitration levels were higher in the kidney of iron + diabetes group as compared to iron or diabetes group. However, iron supplementation did not elevate the glucose level of a diabetic further. These results suggested that iron increased the diabetic renal injury probably through increased oxidative/nitrative stress and reduced antioxidant capacity instead of promoting a rise in blood sugar levels; iron might be a potential cofactor of diabetic nephropathy, and strict control of iron would be important under diabetic state.
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Affiliation(s)
- Wanxia Gao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
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10
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Morgan JLL, Ritchie LE, Crucian BE, Theriot C, Wu H, Sams C, Smith SM, Turner ND, Zwart SR. Increased dietary iron and radiation in rats promote oxidative stress, induce localized and systemic immune system responses, and alter colon mucosal environment. FASEB J 2013; 28:1486-98. [DOI: 10.1096/fj.13-239418] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jennifer L. L. Morgan
- Oak Ridge Associated UniversitiesNational Aeronautics and Space Administration (NASA) Post‐Doctoral Fellowship Program, NASA Lyndon B. Johnson Space CenterHoustonTexasUSA
| | - Lauren E. Ritchie
- Department of Nutrition and Food ScienceTexas A&M UniversityCollege StationTexasUSA
| | - Brian E. Crucian
- Biomedical Research and Environmental Sciences DivisionNASA Lyndon B. Johnson Space CenterHoustonTexasUSA
| | - Corey Theriot
- Department of Preventive Medicine and Community HealthUniversity of Texas Medical BranchGalvestonTexasUSA
| | - Honglu Wu
- Biomedical Research and Environmental Sciences DivisionNASA Lyndon B. Johnson Space CenterHoustonTexasUSA
| | - Clarence Sams
- Space and Clinical Operations Division, Human Health and Performance DirectorateNASA Lyndon B. Johnson Space CenterHoustonTexasUSA
| | - Scott M. Smith
- Biomedical Research and Environmental Sciences DivisionNASA Lyndon B. Johnson Space CenterHoustonTexasUSA
| | - Nancy D. Turner
- Department of Nutrition and Food ScienceTexas A&M UniversityCollege StationTexasUSA
| | - Sara R. Zwart
- Division of Space Life SciencesUniversities Space Research AssociationHoustonTexasUSA
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Corton JC, Cunningham ML, Hummer BT, Lau C, Meek B, Peters JM, Popp JA, Rhomberg L, Seed J, Klaunig JE. Mode of action framework analysis for receptor-mediated toxicity: The peroxisome proliferator-activated receptor alpha (PPARα) as a case study. Crit Rev Toxicol 2013; 44:1-49. [PMID: 24180432 DOI: 10.3109/10408444.2013.835784] [Citation(s) in RCA: 161] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Several therapeutic agents and industrial chemicals induce liver tumors in rodents through the activation of the peroxisome proliferator-activated receptor alpha (PPARα). The cellular and molecular events by which PPARα activators induce rodent hepatocarcinogenesis has been extensively studied and elucidated. This review summarizes the weight of evidence relevant to the hypothesized mode of action (MOA) for PPARα activator-induced rodent hepatocarcinogenesis and identifies gaps in our knowledge of this MOA. Chemical-specific and mechanistic data support concordance of temporal and dose-response relationships for the key events associated with many PPARα activators including a phthalate ester plasticizer di(2-ethylhexyl) phthalate (DEHP) and the drug gemfibrozil. While biologically plausible in humans, the hypothesized key events in the rodent MOA, for PPARα activators, are unlikely to induce liver tumors in humans because of toxicodynamic and biological differences in responses. This conclusion is based on minimal or no effects observed on growth pathways, hepatocellular proliferation and liver tumors in humans and/or species (including hamsters, guinea pigs and cynomolgous monkeys) that are more appropriate human surrogates than mice and rats at overlapping dose levels. Overall, the panel concluded that significant quantitative differences in PPARα activator-induced effects related to liver cancer formation exist between rodents and humans. On the basis of these quantitative differences, most of the workgroup felt that the rodent MOA is "not relevant to humans" with the remaining members concluding that the MOA is "unlikely to be relevant to humans". The two groups differed in their level of confidence based on perceived limitations of the quantitative and mechanistic knowledge of the species differences, which for some panel members strongly supports but cannot preclude the absence of effects under unlikely exposure scenarios.
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Abstract
Mg deficiency accelerates Fe accumulation in the liver, which may induce various metabolic disturbances. In the present study, we examined the gene expression of Hepcidin, a peptide hormone produced in the liver to regulate intestinal Fe absorption negatively, in Mg-deficient rats. Although liver Fe concentration was significantly higher in rats fed an Mg-deficient diet for 4 weeks than in rats fed a control diet, Hepcidin expression in the liver was comparable between the dietary groups. Previous studies revealed that Fe overload up-regulated Hepcidin expression through transcriptional activation by Fe-induced bone morphogenetic protein (Bmp) 6, a growth/differentiation factor belonging to the transforming growth factor-β family, in the liver. Mg deficiency up-regulated the expression of Bmp6 but did not affect the expression of inhibition of DNA binding 1, a sensitive Bmp-responsive gene. In addition, the expression of Bmp receptors such as activin receptor-like kinase 2 (Alk2), activin receptor type IIA (Actr2a), activin receptor type IIB (Actr2b) and Bmp type II receptor (Bmpr2) was lower in the liver of Mg-deficient rats than in that of control rats. The present study indicates that accumulation of hepatic Fe by Mg deficiency is a stimulant inducing Bmp6 expression but not Hepcidin expression by blunting Bmp signalling possibly resulting from down-regulation of the receptor expression. Unresponsive Hepcidin expression may have a role in Mg deficiency-induced changes related to increased liver Fe.
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Mishra D, Sudarshan M, Chakraborty A. Elemental alteration, iron overloading and metallothionein induction in experimental hepatocarcinogenesis: A free radical-mediated process? Toxicol Lett 2011; 203:40-7. [DOI: 10.1016/j.toxlet.2011.02.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 02/17/2011] [Accepted: 02/21/2011] [Indexed: 11/24/2022]
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Jagetia GC, Reddy TK. Alleviation of iron induced oxidative stress by the grape fruit flavanone naringin in vitro. Chem Biol Interact 2011; 190:121-8. [PMID: 21345335 DOI: 10.1016/j.cbi.2011.02.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 02/08/2011] [Accepted: 02/09/2011] [Indexed: 02/07/2023]
Abstract
Iron is an essential element that participates in several metabolic activities of cells; however, excess iron is a major cause of iron-induced oxidative stress and several human diseases. The protective effect of naringin, a grape fruit flavanone, was studied in iron overloaded isolated mouse liver mitochondria, where the isolated mitochondrial fraction was incubated with various concentrations of naringin before ferric ion loading. Iron overloading of mitochondrial fraction resulted in an increase in lipid peroxidation, protein oxidation, and DNA damage, whereas iron overload reduced the glutathione (GSH) concentration, glutathione-S-transferase (GST), glutathione peroxidase (GSHPx), catalase and superoxide dismutase (SOD) activities. Pretreatment of mitochondrial fraction with naringin inhibited iron-induced lipid peroxidation, protein oxidation, and DNA damage. Conversely, naringin supplementation arrested iron-induced depletion in the GSH contents, GSHPx, GST, SOD and catalase activities significantly. Ferric iron reduction assay revealed that naringin could not reduce ferric iron into ferrous iron indicating that it did not exhibit prooxidant activity. Iron free coordination site assay indicated that naringin was unable to occupy all the active sites of iron indicating that naringin did not completely chelate iron. Our study demonstrates that naringin was able to share the burden of endogenous oxidants by inhibiting the iron-induced depletion of all important antioxidant enzymes as well as GSH and may act as a good antioxidant.
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Cho SH. Serum Ferritin and Metabolic Syndrome in Perimenopausal and Postmenopausal Women. ACTA ACUST UNITED AC 2011. [DOI: 10.6118/jksm.2011.17.3.166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Soo Hyun Cho
- Department of Family Medicine, College of Medicine, Chung-Ang University, Seoul, Korea
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The Role of NF-kappaB in PPARalpha-Mediated Hepatocarcinogenesis. PPAR Res 2009; 2008:286249. [PMID: 19197377 PMCID: PMC2633453 DOI: 10.1155/2008/286249] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2008] [Revised: 10/03/2008] [Accepted: 11/03/2008] [Indexed: 01/04/2023] Open
Abstract
In this review, the role of NF-kappaB in the induction of hepatocarcinogenesis by peroxisome proliferators is examined. The administration of peroxisome proliferators for more than a three-day period leads to the activation of NF-kappaB in the livers of rats and mice. On the other hand, peroxisome proliferator activated receptor-alpha (PPARalpha) activation in non-hepatic tissues can lead to the inhibition of NF-kappaB activation. Several lines of evidence support the hypothesis that the activation of NF-kappaB by peroxisome proliferators in the liver is mediated by oxidative stress. The role of NF-kappaB in peroxisome proliferator-induced hepatocarcinogenesis has been examined using NF-kappaB knockout models. Specifically, the induction of cell proliferation and the promotion of liver carcinogenesis are inhibited in mice lacking the p50 subunit of NF-kappaB. Overall, the activation of NF-kappaB appears to be important in the carcinogenic activity of peroxisome proliferators.
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Kruszewski M, Iwaneńko T, Bartłomiejczyk T, Woliński J, Starzyński RR, Gralak MA, Zabielski R, Lipiński P. Hepatic iron content corresponds with the susceptibility of lymphocytes to oxidative stress in neonatal pigs. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2008; 657:146-9. [DOI: 10.1016/j.mrgentox.2008.08.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 07/25/2008] [Accepted: 08/27/2008] [Indexed: 11/30/2022]
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18
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Does ascorbic acid supplementation affect iron bioavailability in rats fed micronized dispersible ferric pyrophosphate fortified fruit juice? Eur J Nutr 2008; 47:470-8. [DOI: 10.1007/s00394-008-0750-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Accepted: 10/07/2008] [Indexed: 11/25/2022]
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19
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Differential effect of high dietary iron on α-tocopherol and retinol levels in the liver and serum of mice fed olive oil– and corn oil–enriched diets. Nutr Res 2008; 28:263-9. [DOI: 10.1016/j.nutres.2008.01.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Revised: 01/04/2008] [Accepted: 01/17/2008] [Indexed: 11/22/2022]
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20
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Sarhan R, El-Azim SAA, Motawi TM, Hamdy MA. Protective Effect of Turmeric, Ginkgo biloba, Silymarin Separately or in Combination, on Iron-Induced Oxidative Stress and Lipid Peroxidation in Rats. INT J PHARMACOL 2007. [DOI: 10.3923/ijp.2007.375.384] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Hermans N, Cos P, De Meyer GRY, Maes L, Pieters L, Vanden Berghe D, Vlietinck AJ, De Bruyne T. Study of potential systemic oxidative stress animal models for the evaluation of antioxidant activity: status of lipid peroxidation and fat-soluble antioxidants. J Pharm Pharmacol 2007; 59:131-6. [PMID: 17227630 DOI: 10.1211/jpp.59.1.0017] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Although many compounds have already been tested in-vitro to determine their antioxidant profile, it is necessary to investigate the in-vivo effect of potential antioxidants. However, representative models of systemic oxidative stress have been poorly studied. Here, different potential systemic oxidative stress animal models have been investigated. These included a vitamin E-deficient rat, a diabetic rat and an atherosclerotic rabbit model. Plasma/serum malondialdehyde was measured as a parameter of oxidative damage. Plasma/serum fat-soluble antioxidants were determined as markers of antioxidant defence. We demonstrated that vitamin E-deficient rats were not suitable as a model of systemic oxidative stress, whereas diabetic and atherosclerotic animals showed increased systemic oxidative damage, as reflected by significantly augmented plasma/serum malondialdehyde. Moreover, plasma coenzyme Q9 increased by 80% in diabetic rats, confirming systemic oxidative stress. In view of these observations and economically favouring factors, the diabetic rat appeared to be the most appropriate systemic oxidative stress model. These findings have provided important information concerning systemic oxidative stress animal models for the in-vivo study of antioxidants.
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Affiliation(s)
- Nina Hermans
- Laboratory of Nutrition and Functional Food Science, Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium.
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22
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Woods CG, Burns AM, Maki A, Bradford BU, Cunningham ML, Connor HD, Kadiiska MB, Mason RP, Peters JM, Rusyn I. Sustained formation of alpha-(4-pyridyl-1-oxide)-N-tert-butylnitrone radical adducts in mouse liver by peroxisome proliferators is dependent upon peroxisome proliferator-activated receptor-alpha, but not NADPH oxidase. Free Radic Biol Med 2007; 42:335-42. [PMID: 17210446 PMCID: PMC1829322 DOI: 10.1016/j.freeradbiomed.2006.10.053] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2006] [Revised: 10/03/2006] [Accepted: 10/28/2006] [Indexed: 11/28/2022]
Abstract
Reactive oxygen species are thought to be crucial for peroxisome proliferator-induced liver carcinogenesis. Free radicals have been shown to mediate the production of mitogenic cytokines by Kupffer cells and cause DNA damage in rodent liver. Previous in vivo experiments demonstrated that acute administration of the peroxisome proliferator di(2-ethylhexyl) phthalate (DEHP) led to an increase in production of alpha-(4-pyridyl-1-oxide)-N-tert-butylnitrone (POBN) radical adducts in liver, an event that was dependent on Kupffer cell NADPH oxidase, but not peroxisome proliferator-activated receptor (PPAR)alpha. Here, we hypothesized that continuous treatment with peroxisome proliferators will cause a sustained formation in POBN radical adducts in liver. Mice were fed diets containing either 4-chloro-6-(2,3-xylidino)-2-pyrimidinylthioacetic acid (WY-14,643, 0.05% w/w) or DEHP (0.6% w/w) for up to 3 weeks. Liver-derived radical production was assessed in bile samples by measuring POBN radical adducts using electron spin resonance. Our data indicate that WY-14,643 causes a sustained increase in POBN radical adducts in mouse liver and that this effect is greater than that of DEHP. To understand the molecular source of these radical species, NADPH oxidase-deficient (p47phox-null) and PPARalpha-null mice were examined after treatment with WY-14,643. No increase in radicals was observed in PPARalpha-null mice that were treated with WY-14,643 for 3 weeks, while the response in p47phox-nulls was similar to that of wild-type mice. These results show that PPARalpha, not NADPH oxidase, is critical for a sustained increase in POBN radical production caused by peroxisome proliferators in rodent liver. Therefore, peroxisome proliferator-induced POBN radical production in Kupffer cells may be limited to an acute response to these compounds in mouse liver.
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Affiliation(s)
- Courtney G. Woods
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599
| | - Amanda M. Burns
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599
| | - Akira Maki
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599
| | - Blair U. Bradford
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599
| | | | - Henry D. Connor
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, NC 27709
| | - Maria B. Kadiiska
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, NC 27709
| | - Ronald P. Mason
- Laboratory of Pharmacology and Chemistry, NIEHS, Research Triangle Park, NC 27709
| | - Jeffrey M. Peters
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, State College, PA 16802
| | - Ivan Rusyn
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599
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23
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Elmegeed GA, Ahmed HH, Hussein JS. Novel synthesized aminosteroidal heterocycles intervention for inhibiting iron-induced oxidative stress. Eur J Med Chem 2005; 40:1283-94. [PMID: 16154236 DOI: 10.1016/j.ejmech.2005.07.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2005] [Revised: 07/16/2005] [Accepted: 07/25/2005] [Indexed: 11/20/2022]
Abstract
The objective of this study was to elucidate the potential role of novel synthesized aminosteroidal heterocyclic compounds 2, 5, 9b and 10c against iron-induced oxidative stress with particular insight on erythrocyte ghosts in male rats. Chronic iron supplementation (3000 mg kg(-1) diet) for 6 weeks significantly increased plasma iron and ferritin levels. It also produced significant increase in plasma TNF-alpha and NO levels. Lipid metabolism was also affected by excess iron, so that plasma and erythrocyte membrane total cholesterol, triglycerides, phospholipids and total lipid levels were significantly elevated. In consequence, a significant increase in plasma leptin level was detected. Iron overload clearly induces oxidative stress as indicated by the significant increase in both plasma and erythrocyte membrane lipid peroxidation levels. Noteworthy, excess iron not only decreased the mean value of erythrocyte membrane protein but also caused marked alterations in the membrane protein fractions with concomitant inhibition in erythrocyte membrane ATPases activity. On the other hand, treatment with the aminosteriodal heterocyclic compounds especially compounds 5, 2, and 10c in an oral dose of 5 mg kg(-1) B.W. per day could ameliorate almost all of the changes in plasma and erythrocyte ghosts components induced by iron overload. The efficacious role of these novel synthesized aminosteriods in preventing iron-induced oxidative stress may be mediated through their iron chelating properties, anti-lipid peroxidation activities and membrane stabilizing actions. The encouraging results obtained in the present study lend credence to substantial investigation to assess the use of these compounds as a potent line of therapy to retard the pathogenesis of iron overload diseases.
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Affiliation(s)
- Gamal A Elmegeed
- Hormones Department, National Research Center, Dokki, Giza, Egypt.
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24
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Yeung CK, Zhu L, Glahn RP, Miller DD. Tissue iron distribution and adaptation of iron absorption in rats exposed to a high dietary level of NaFeEDTA. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:8087-91. [PMID: 16190675 DOI: 10.1021/jf051242r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Although it has been shown that iron absorption from NaFeEDTA, a promising iron fortificant, is effectively down-regulated in iron-loaded rats, effects of prolonged exposure to high dietary levels of NaFeEDTA are not well understood. The objectives of this study were to determine whether rats can adapt to a high dietary level of NaFeEDTA by down-regulating iron absorption, and to determine effects on tissue iron distribution, with or without an iron absorption inhibitor. Male Sprague-Dawley rats were exposed to diets supplemented with FeSO4 or NaFeEDTA at 1200 mg of Fe/kg of diet, with or without tea, for 27 days. Iron absorption measured by whole-body counting before and after exposure showed that rats adapted to the high dietary level of FeSO4 or NaFeEDTA by down-regulating iron absorption to a similar extent. However, nonheme iron concentrations in liver and spleen were about 35-50% lower, whereas the concentration in kidney was about 300% higher in rats fed NaFeEDTA, compared to rats fed FeSO4. Tea had no major impact on iron absorption or iron status, regardless of iron source. Our results showed that although iron absorption was down-regulated similarly, body iron distribution was markedly different between rats exposed to FeSO4 and those exposed to NaFeEDTA. Further studies are warranted to determine the effects of prolonged exposure to dietary NaFeEDTA on kidney iron accumulation and kidney function.
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Affiliation(s)
- Chi Kong Yeung
- Department of Food Science, Cornell University, Ithaca, New York 14853, USA
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25
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Cockell KA, Wotherspoon ATL, Belonje B, Fritz ME, Madère R, Hidiroglou N, Plouffe LJ, Ratnayake WMN, Kubow S. Limited effects of combined dietary copper deficiency/iron overload on oxidative stress parameters in rat liver and plasma. J Nutr Biochem 2005; 16:750-6. [PMID: 16098731 DOI: 10.1016/j.jnutbio.2005.04.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2005] [Revised: 04/06/2005] [Accepted: 04/18/2005] [Indexed: 10/25/2022]
Abstract
Copper (Cu) deficiency decreases the activity of Cu-dependent antioxidant enzymes such as Cu,zinc-superoxide dismutase (Cu,Zn-SOD) and may be associated with increased susceptibility to oxidative stress. Iron (Fe) overload represents a dietary oxidative stress relevant to overuse of Fe-containing supplements and to hereditary hemochromatosis. In a study to investigate oxidative stress interactions of dietary Cu deficiency with Fe overload, weanling male Long-Evans rats were fed one of four sucrose-based modified AIN-93G diets formulated to differ in Cu (adequate 6 mg/kg diet vs. deficient 0.5 mg/kg) and Fe (adequate 35 mg/kg vs. overloaded 1500 mg/kg) in a 2 x 2 factorial design for 4 weeks prior to necropsy. Care was taken to minimize oxidation of the diets prior to feeding to the rats. Liver and plasma Cu content and liver Cu,Zn-SOD activity declined with Cu deficiency and liver Fe increased with Fe overload, confirming the experimental dietary model. Liver thiobarbituric acid reactive substances were significantly elevated with Fe overload (pooled across Cu treatments, 0.80+/-0.14 vs. 0.54+/-0.08 nmol/mg protein; P<.0001) and not affected by Cu deficiency. Liver cytosolic protein carbonyl content and the concentrations of several oxidized cholesterol species in liver tissue did not change with these dietary treatments. Plasma protein carbonyl content decreased in Cu-deficient rats and was not influenced by dietary Fe overload. The various substrates (lipid, protein and cholesterol) appeared to differ in their susceptibility to the in vivo oxidative stress induced by dietary Fe overload, but these differences were not exacerbated by Cu deficiency.
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Affiliation(s)
- Kevin A Cockell
- Nutrition Research Division, Health Products and Food Branch, Health Canada, Ottawa, ON, Canada K1A 0L2.
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26
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Mainous AG, Wells BJ, Koopman RJ, Everett CJ, Gill JM. Iron, lipids, and risk of cancer in the Framingham Offspring cohort. Am J Epidemiol 2005; 161:1115-22. [PMID: 15937020 DOI: 10.1093/aje/kwi131] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Iron and lipids combine to create oxidative stress, and oxidative stress has a role in the development of cancer. The objective was to determine the risk of cancer among persons who had both elevated iron and lipids. The authors conducted an analysis of the cohort available in the Framingham Offspring Study. Adults aged 30 or more years at baseline had serum iron and high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol, and very low density lipoprotein cholesterol (VLDL-C) assessed in 1979-1982 and were followed for development of cancer until 1996-1997 (n = 3,278). Cox regression models were computed while controlling for age, gender, smoking status, and body mass index. In adjusted models, both elevated iron (hazard ratio (HR) = 1.66, 95% confidence interval (CI): 1.11, 2.46; 29 cases) and VLDL-C (HR = 1.54, 95% CI: 1.04, 2.28; 93 cases) had significant independent risks for development of cancer. When elevated iron was combined with elevated VLDL-C, the adjusted relative risk of cancer increased (HR = 2.68, 95% CI: 1.49, 4.83; 18 cases). Elevated iron and low HDL-C also had a significant adjusted relative risk of cancer (HR = 2.82, 95% CI: 1.50, 5.28; 14 cases). The results suggest that elevated serum iron levels coupled with either high VLDL-C or low HDL-C appear to interact to increase cancer risk in this cohort.
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Affiliation(s)
- Arch G Mainous
- Department of Family Medicine, Medical University of South Carolina, 295 Calhoun Street, Charleston, SC 29425, USA.
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27
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Zhao Y, Li H, Gao Z, Xu H. Effects of dietary baicalin supplementation on iron overload-induced mouse liver oxidative injury. Eur J Pharmacol 2005; 509:195-200. [PMID: 15733556 DOI: 10.1016/j.ejphar.2004.11.060] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2004] [Accepted: 11/26/2004] [Indexed: 11/18/2022]
Abstract
Iron overload is one of the most common metal related toxicity. Under this circumstance, excessive iron deposition in liver will lead to further injury such as hepatocellular necrosis, inflammation, fibrosis, and in some cases even to carcinoma. In this paper, the effect of a nature flavonoid, baicalin, on iron overload-induced mouse liver oxidative injury has been studied. It was found that when iron-dextran-induced iron overload, mice were fed baicalin-containing diet (0.25% and 1%) for 50 days, hepatic iron, liver-to-body weight ratio, and hepatic lipid peroxidation were dose-dependently decreased; while catalase activity, total antioxidant status, and serum iron content were dose dependently increased. The protective effect of baicalin on liver of iron overload mouse may due to both the antioxidant and iron chelation activities of baicalin. These data provide preliminary experimental support for baicalin as medicine for iron overload diseases.
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Affiliation(s)
- Yuling Zhao
- Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074, PR China
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28
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Ackerman Z, Oron-Herman M, Grozovski M, Rosenthal T, Pappo O, Link G, Sela BA. Fructose-induced fatty liver disease: hepatic effects of blood pressure and plasma triglyceride reduction. Hypertension 2005; 45:1012-8. [PMID: 15824194 DOI: 10.1161/01.hyp.0000164570.20420.67] [Citation(s) in RCA: 167] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The most known risk factor for nonalcoholic fatty liver disease (NAFLD) is the metabolic syndrome. In this study, we characterized changes in liver pathology, hepatic lipid composition, and hepatic iron concentration (HIC) occurring in rats given fructose-enriched diet (FED), with and without therapeutic maneuvers to reduce blood pressure and plasma triglycerides. Rats were given FED or standard rat chow for 5 weeks. Rats on FED were divided into 4 groups: receiving amlodipine (15 mg/kg per day), captopril (90 mg/kg per day), bezafibrate (10 mg/kg per day) in the last 2 weeks, or a control group that received FED only. FED rats had hepatic macrovesicular and microvesicular fat deposits develop, with increase in hepatic triglycerides (+198%) and hepatic cholesterol (+89%), but a decrease in hepatic phospholipids (-36%), hypertriglyceridemia (+223%), and hypertension (+15%), without increase in HIC. Amlodipine reduced blood pressure (-18%), plasma triglycerides (-12%), but there was no change in hepatic triglycerides and phospholipids concentrations. Captopril reduced blood pressure (-24%), plasma triglycerides (-36%), hepatic triglycerides (-51%), and hepatic macrovesicular fat (-51%), but increased HIC (+23%), with a borderline increase in hepatic fibrosis. Bezafibrate reduced plasma triglycerides (-49%), hepatic triglycerides (-78%), hepatic macrovesicular fat (-90%), and blood pressure (-11%). We conclude that FED rats can be a suitable model for human NAFLD. Drugs administered to treat various aspects of the metabolic syndrome could have hepatic effects. An increase in HIC in rats with NAFLD could be associated with increased hepatic fibrosis.
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Affiliation(s)
- Zvi Ackerman
- Hebrew University Hadassah Medical Center, Jerusalem, Israel.
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29
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Abstract
Based on epidemiologic evidence citing excess iron as a risk factor for many diseases, and oxidative stress as an underlying cause for those diseases, iron-induced oxidative stress has recently gained attention. Although iron can participate in oxidative reactions to generate free radicals under in vitro conditions, its involvement in vivo in the cause or progression of diseases is questionable.
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Affiliation(s)
- Manju B Reddy
- Department of Food Science and Human Nutrition, Center for Designing Foods to Improve Nutrition, 1127 HNSB, Iowa State University, Ames, IA 50011, USA
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30
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Mainous AG, Wells BJ, Everett CJ, Gill JM, King DE. Association of ferritin and lipids with C-reactive protein. Am J Cardiol 2004; 93:559-62. [PMID: 14996579 DOI: 10.1016/j.amjcard.2003.11.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2003] [Revised: 11/13/2003] [Accepted: 11/13/2003] [Indexed: 10/26/2022]
Abstract
C-reactive protein (CRP) and lipids (e.g., low-density lipoprotein [LDL]) are both markers of cardiovascular disease risk, yet they are not highly correlated. Oxidative stress of lipids induced by iron may play a role in vascular inflammation, as indicated by CRP. The purpose of this study was to examine, in a representative sample of United States adults, the relation between ferritin, lipids, and CRP. We analyzed data on adults (aged > or =25 years) in the National Health and Nutrition Examination Survey III, a national public-use data set collected between 1988 and 1994. Ferritin, total cholesterol, LDL, high-density lipoprotein, and ferritin-lipid combinations were analyzed in relation to CRP in age-, gender-, and race-adjusted models as well as models with other potential confounding variables. In adjusted models, neither elevated ferritin (odds ratio [OR] 1.11, 95% confidence interval [CI] 0.94 to 1.32) nor elevated LDL was significantly associated with elevated CRP (OR 1.03, 95% CI 0.79 to 1.33). Patients with elevated ferritin and elevated LDL were more likely to have elevated CRP (OR 1.68; 95% CI 1.06 to 2.68). Patients with elevated ferritin and low high-density lipoprotein were also more likely to have elevated CRP (OR 1.71; 95% CI 1.28 to 2.27). These results suggest that both iron and lipids induce inflammation. Future research needs to focus on preventive medicine to decrease iron in patients with elevated lipids.
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Affiliation(s)
- Arch G Mainous
- Department of Family Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, USA.
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31
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Chaston TB, Richardson DR. Iron chelators for the treatment of iron overload disease: relationship between structure, redox activity, and toxicity. Am J Hematol 2003; 73:200-10. [PMID: 12827659 DOI: 10.1002/ajh.10348] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The success of the iron (Fe) chelator desferrioxamine (DFO) in the treatment of beta-thalassemia is limited by its lack of bioavailability. The design and characterization of synthetic alternatives to DFO has attracted much scientific interest and has led to the discovery of orally active chelators that can remove pathological Fe deposits. However, chelators that access intracellular Fe pools can be toxic by either inhibiting Fe-containing enzymes or promoting Fe-mediated free radical damage. Interestingly, toxicity does not necessarily correlate with Fe-binding affinity or with chelation efficacy, suggesting that other factors may promote the cytopathic effects of chelators. In this review, we discuss the interactions of chelators and their Fe complexes with biomolecules that can lead to toxicity and tissue damage.
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Affiliation(s)
- Timothy B Chaston
- Children's Cancer Institute Australia for Medical Research, The Iron Metabolism and Chelation Program, Randwick, Sydney, New South Wales, Australia
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32
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Abstract
Measurement of micronutrient status in the presence of inflammation is difficult for several reasons. Changes in levels of acute phase proteins are associated with increased plasma levels of some indicators of micronutrient status, such as ferritin, and decrease of others, such as retinol. Alterations in the plasma levels of acute phase proteins can occur from hemodilution, sequestration and increased or decreased rates of synthesis and breakdown. How much these relate to functional deficiency is not known. Assays that are less perturbed by inflammation, such as the transferrin receptor assay, and adjustment of plasma micronutrient levels according to different cutoff levels for acute phase proteins are helpful but they do not enable precise assessment of micronutrient status among individuals who are infected. Improving assessment of micronutrient status is important if micronutrient interventions are to be targeted to those with the greatest need.
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Affiliation(s)
- Andrew Tomkins
- Centre for International Health, Institute of Child Health, University College London, WC1N 1EH.
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